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Hello,

How many serial ports are available to control external devices on the APM2.5?

This is my best estimate so far:

4 USARTS on the Atmega2560

UART0 for wireless telemetry, also shared with usb serial

UART1 for GPS

UART2 may be used as alternative wireless telemetry.  If not, then this is available for use.

UART3 is available for use? Is this exposed?

Thanks

Ritchie